summaryrefslogtreecommitdiff
path: root/drivers/acpi/acpica/exfield.c
blob: 2b89a496de65c69a652e0f4bf6c63ba865726991 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: exfield - AML execution - field_unit read/write
 *
 * Copyright (C) 2000 - 2022, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acdispat.h"
#include "acinterp.h"
#include "amlcode.h"

#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exfield")

/*
 * This table maps the various Attrib protocols to the byte transfer
 * length. Used for the generic serial bus.
 */
#define ACPI_INVALID_PROTOCOL_ID        0x80
#define ACPI_MAX_PROTOCOL_ID            0x0F
static const u8 acpi_protocol_lengths[] = {
	ACPI_INVALID_PROTOCOL_ID,	/* 0 - reserved */
	ACPI_INVALID_PROTOCOL_ID,	/* 1 - reserved */
	0x00,			/* 2 - ATTRIB_QUICK */
	ACPI_INVALID_PROTOCOL_ID,	/* 3 - reserved */
	0x01,			/* 4 - ATTRIB_SEND_RECEIVE */
	ACPI_INVALID_PROTOCOL_ID,	/* 5 - reserved */
	0x01,			/* 6 - ATTRIB_BYTE */
	ACPI_INVALID_PROTOCOL_ID,	/* 7 - reserved */
	0x02,			/* 8 - ATTRIB_WORD */
	ACPI_INVALID_PROTOCOL_ID,	/* 9 - reserved */
	0xFF,			/* A - ATTRIB_BLOCK  */
	0xFF,			/* B - ATTRIB_BYTES */
	0x02,			/* C - ATTRIB_PROCESS_CALL */
	0xFF,			/* D - ATTRIB_BLOCK_PROCESS_CALL */
	0xFF,			/* E - ATTRIB_RAW_BYTES */
	0xFF			/* F - ATTRIB_RAW_PROCESS_BYTES */
};

#define PCC_MASTER_SUBSPACE     3

/*
 * The following macros determine a given offset is a COMD field.
 * According to the specification, generic subspaces (types 0-2) contains a
 * 2-byte COMD field at offset 4 and master subspaces (type 3) contains a 4-byte
 * COMD field starting at offset 12.
 */
#define GENERIC_SUBSPACE_COMMAND(a)     (4 == a || a == 5)
#define MASTER_SUBSPACE_COMMAND(a)      (12 <= a && a <= 15)

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_get_protocol_buffer_length
 *
 * PARAMETERS:  protocol_id     - The type of the protocol indicated by region
 *                                field access attributes
 *              return_length   - Where the protocol byte transfer length is
 *                                returned
 *
 * RETURN:      Status and decoded byte transfer length
 *
 * DESCRIPTION: This routine returns the length of the generic_serial_bus
 *              protocol bytes
 *
 ******************************************************************************/

acpi_status
acpi_ex_get_protocol_buffer_length(u32 protocol_id, u32 *return_length)
{

	if ((protocol_id > ACPI_MAX_PROTOCOL_ID) ||
	    (acpi_protocol_lengths[protocol_id] == ACPI_INVALID_PROTOCOL_ID)) {
		ACPI_ERROR((AE_INFO,
			    "Invalid Field/AccessAs protocol ID: 0x%4.4X",
			    protocol_id));

		return (AE_AML_PROTOCOL);
	}

	*return_length = acpi_protocol_lengths[protocol_id];
	return (AE_OK);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_read_data_from_field
 *
 * PARAMETERS:  walk_state          - Current execution state
 *              obj_desc            - The named field
 *              ret_buffer_desc     - Where the return data object is stored
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Read from a named field. Returns either an Integer or a
 *              Buffer, depending on the size of the field and whether if a
 *              field is created by the create_field() operator.
 *
 ******************************************************************************/

acpi_status
acpi_ex_read_data_from_field(struct acpi_walk_state *walk_state,
			     union acpi_operand_object *obj_desc,
			     union acpi_operand_object **ret_buffer_desc)
{
	acpi_status status;
	union acpi_operand_object *buffer_desc;
	void *buffer;
	u32 buffer_length;

	ACPI_FUNCTION_TRACE_PTR(ex_read_data_from_field, obj_desc);

	/* Parameter validation */

	if (!obj_desc) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}
	if (!ret_buffer_desc) {
		return_ACPI_STATUS(AE_BAD_PARAMETER);
	}

	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
		/*
		 * If the buffer_field arguments have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_buffer_field_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_GSBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_PLATFORM_RT)) {

		/* SMBus, GSBus, IPMI serial */

		status = acpi_ex_read_serial_bus(obj_desc, ret_buffer_desc);
		return_ACPI_STATUS(status);
	}

	/*
	 * Allocate a buffer for the contents of the field.
	 *
	 * If the field is larger than the current integer width, create
	 * a BUFFER to hold it. Otherwise, use an INTEGER. This allows
	 * the use of arithmetic operators on the returned value if the
	 * field size is equal or smaller than an Integer.
	 *
	 * However, all buffer fields created by create_field operator needs to
	 * remain as a buffer to match other AML interpreter implementations.
	 *
	 * Note: Field.length is in bits.
	 */
	buffer_length =
	    (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.bit_length);

	if (buffer_length > acpi_gbl_integer_byte_width ||
	    (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD &&
	     obj_desc->buffer_field.is_create_field)) {

		/* Field is too large for an Integer, create a Buffer instead */

		buffer_desc = acpi_ut_create_buffer_object(buffer_length);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}
		buffer = buffer_desc->buffer.pointer;
	} else {
		/* Field will fit within an Integer (normal case) */

		buffer_desc = acpi_ut_create_integer_object((u64) 0);
		if (!buffer_desc) {
			return_ACPI_STATUS(AE_NO_MEMORY);
		}

		buffer_length = acpi_gbl_integer_byte_width;
		buffer = &buffer_desc->integer.value;
	}

	if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
	    (obj_desc->field.region_obj->region.space_id ==
	     ACPI_ADR_SPACE_GPIO)) {

		/* General Purpose I/O */

		status = acpi_ex_read_gpio(obj_desc, buffer);
		goto exit;
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_PLATFORM_COMM)) {
		/*
		 * Reading from a PCC field unit does not require the handler because
		 * it only requires reading from the internal_pcc_buffer.
		 */
		ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
				  "PCC FieldRead bits %u\n",
				  obj_desc->field.bit_length));

		memcpy(buffer,
		       obj_desc->field.region_obj->field.internal_pcc_buffer +
		       obj_desc->field.base_byte_offset,
		       (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.
							      bit_length));

		*ret_buffer_desc = buffer_desc;
		return AE_OK;
	}

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldRead [TO]:   Obj %p, Type %X, Buf %p, ByteLen %X\n",
			  obj_desc, obj_desc->common.type, buffer,
			  buffer_length));
	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldRead [FROM]: BitLen %X, BitOff %X, ByteOff %X\n",
			  obj_desc->common_field.bit_length,
			  obj_desc->common_field.start_field_bit_offset,
			  obj_desc->common_field.base_byte_offset));

	/* Lock entire transaction if requested */

	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

	/* Read from the field */

	status = acpi_ex_extract_from_field(obj_desc, buffer, buffer_length);
	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);

exit:
	if (ACPI_FAILURE(status)) {
		acpi_ut_remove_reference(buffer_desc);
	} else {
		*ret_buffer_desc = buffer_desc;
	}

	return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_write_data_to_field
 *
 * PARAMETERS:  source_desc         - Contains data to write
 *              obj_desc            - The named field
 *              result_desc         - Where the return value is returned, if any
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Write to a named field
 *
 ******************************************************************************/

acpi_status
acpi_ex_write_data_to_field(union acpi_operand_object *source_desc,
			    union acpi_operand_object *obj_desc,
			    union acpi_operand_object **result_desc)
{
	acpi_status status;
	u32 buffer_length;
	u32 data_length;
	void *buffer;

	ACPI_FUNCTION_TRACE_PTR(ex_write_data_to_field, obj_desc);

	/* Parameter validation */

	if (!source_desc || !obj_desc) {
		return_ACPI_STATUS(AE_AML_NO_OPERAND);
	}

	if (obj_desc->common.type == ACPI_TYPE_BUFFER_FIELD) {
		/*
		 * If the buffer_field arguments have not been previously evaluated,
		 * evaluate them now and save the results.
		 */
		if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
			status = acpi_ds_get_buffer_field_arguments(obj_desc);
			if (ACPI_FAILURE(status)) {
				return_ACPI_STATUS(status);
			}
		}
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_GPIO)) {

		/* General Purpose I/O */

		status = acpi_ex_write_gpio(source_desc, obj_desc, result_desc);
		return_ACPI_STATUS(status);
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_SMBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_GSBUS
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_IPMI
		    || obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_PLATFORM_RT)) {

		/* SMBus, GSBus, IPMI serial */

		status =
		    acpi_ex_write_serial_bus(source_desc, obj_desc,
					     result_desc);
		return_ACPI_STATUS(status);
	} else if ((obj_desc->common.type == ACPI_TYPE_LOCAL_REGION_FIELD) &&
		   (obj_desc->field.region_obj->region.space_id ==
		    ACPI_ADR_SPACE_PLATFORM_COMM)) {
		/*
		 * According to the spec a write to the COMD field will invoke the
		 * region handler. Otherwise, write to the pcc_internal buffer. This
		 * implementation will use the offsets specified rather than the name
		 * of the field. This is considered safer because some firmware tools
		 * are known to obfiscate named objects.
		 */
		data_length =
		    (acpi_size)ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->field.
							   bit_length);
		memcpy(obj_desc->field.region_obj->field.internal_pcc_buffer +
		       obj_desc->field.base_byte_offset,
		       source_desc->buffer.pointer, data_length);

		if (MASTER_SUBSPACE_COMMAND(obj_desc->field.base_byte_offset)) {

			/* Perform the write */

			ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
					  "PCC COMD field has been written. Invoking PCC handler now.\n"));

			status =
			    acpi_ex_access_region(obj_desc, 0,
						  (u64 *)obj_desc->field.
						  region_obj->field.
						  internal_pcc_buffer,
						  ACPI_WRITE);
			return_ACPI_STATUS(status);
		}
		return (AE_OK);
	}

	/* Get a pointer to the data to be written */

	switch (source_desc->common.type) {
	case ACPI_TYPE_INTEGER:

		buffer = &source_desc->integer.value;
		buffer_length = sizeof(source_desc->integer.value);
		break;

	case ACPI_TYPE_BUFFER:

		buffer = source_desc->buffer.pointer;
		buffer_length = source_desc->buffer.length;
		break;

	case ACPI_TYPE_STRING:

		buffer = source_desc->string.pointer;
		buffer_length = source_desc->string.length;
		break;

	default:
		return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
	}

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldWrite [FROM]: Obj %p (%s:%X), Buf %p, ByteLen %X\n",
			  source_desc,
			  acpi_ut_get_type_name(source_desc->common.type),
			  source_desc->common.type, buffer, buffer_length));

	ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
			  "FieldWrite [TO]:   Obj %p (%s:%X), BitLen %X, BitOff %X, ByteOff %X\n",
			  obj_desc,
			  acpi_ut_get_type_name(obj_desc->common.type),
			  obj_desc->common.type,
			  obj_desc->common_field.bit_length,
			  obj_desc->common_field.start_field_bit_offset,
			  obj_desc->common_field.base_byte_offset));

	/* Lock entire transaction if requested */

	acpi_ex_acquire_global_lock(obj_desc->common_field.field_flags);

	/* Write to the field */

	status = acpi_ex_insert_into_field(obj_desc, buffer, buffer_length);
	acpi_ex_release_global_lock(obj_desc->common_field.field_flags);
	return_ACPI_STATUS(status);
}